haemophagocytic lymphohistiocytosis, familial, type 1

haemophagocytic lymphohistiocytosis, familial, type 1

A rare autosomal recessive disorder (OMIM:267700) characterised by immune dysregulation with hypercytokinaemia, defective NK cell activity, and massive infiltration of several organs by activated lymphocytes and macrophages.

Clinical findings
Fever, hepatosplenomegaly, cytopenia; less commmonly, neurologic defects ranging from irritability and hypotonia to seizures, cranial nerve deficits and ataxia.

Molecular pathology
Thought to be caused defects in HPLH1, the HGNC-approved name for the putative gene on cytogenetic band 9q21.3-q22.